diff --git a/quantulum3/_lang/en_US/tests/quantities.json b/quantulum3/_lang/en_US/tests/quantities.json
index 5a88275..41ef022 100644
--- a/quantulum3/_lang/en_US/tests/quantities.json
+++ b/quantulum3/_lang/en_US/tests/quantities.json
@@ -1544,5 +1544,15 @@
           "surface": "10"
         }
     ]
+  },
+    {
+    "req": "The shortest day at Archangel has only 3 hrs.",
+    "res": [
+        {
+          "value": 3,
+          "unit": "hour",
+          "surface": "3 hrs"
+        }
+    ]
   }
 ]
diff --git a/quantulum3/units.json b/quantulum3/units.json
index 362c7f7..380ed03 100644
--- a/quantulum3/units.json
+++ b/quantulum3/units.json
@@ -2248,7 +2248,8 @@
     "symbols": [
       "h",
       "hr",
-      "hs"
+      "hs",
+      "hrs"
     ]
   },
   "day": {
@@ -4332,4 +4333,4 @@
       "nt"
     ]
   }
-}
\ No newline at end of file
+}